Lithium is the lightest metal on the Periodic Table, in contrast to lead in lead-acid batteries, which is one of the heaviest.Therefore, an electric car has a normal 12-volt lead-acid battery to power all of the accessories.They have a limited capacity (a typical lead-acid battery pack might hold 12 to 15 kilowatt-hours of electricity, giving a car a range of only 50 miles or so).